Drilling bit



May 8, 1928. V I 1,669,360

, r C. A. TOWNE I DRILLING BIT I Filed June 11. 1924 2 Sheets Sheet 1May 8, 1928.

C. A. TOWNE 2 Sheets-Shes Fatented May 8, 1928.

PATENT OFFICE.

GEARLES A. 'rownn, F DRUMRIGHT, OKLAHOMA.

nmririmo BIT. p a

Application filed June 11, 1924.. Serial No. 719,375. 7

blade, but this is ineffectual in mixing the mud, because of its failureto agitate and stir the mud on account of its very smoothness.

The chief function of my present invention is to overcome thisobjection, and it consists in a bit having laterally-extendingprojections which will keep the mud and material thoroughly mixed andagitated,enabling the bailer's to remove all the mud, since it isthoroughly mixed and is not allowed to set tie in the bottom of thehole.

Frequently it happens that the threaded pin on the bit will break off,or become an screwed from the drill stem. In the usual style of bit-s,the blade is so heavy that it cannot be made-of any great length, and itfalls sidewise in the hole, and especially is it true in the fifteeninch and larger holes. In the event of such an accident occurring, it isfrequently impossible to'iish the bitout of the hole. 1

Another object of mypresent invention is to obviate this difiiculty, andit comprises a hit of much greater length for the same weight, and thelugs or projections on the side keeping the bit in an upright positionin the hole, thus making it comparatively easy toobtain a hold on thetop of the bit with tools made for the purpose, whereby to remove thebroken bit from the hole.

In the accompanying drawings:

Figs. 1 and 2 are views ofone form of the bit in side elevation and atright-angles to each other; I p

Fig. 3'is a bottom plan view;

Figs. 4- and 5 are views of slightly modified forms of the bit. I

Referring'to Figs. 1, 2 and 3, A represents the stem of the bit; and 1is the cutting end, it preferably having recesses 52 on opposite sidesspread and beveled or sharpened at the cutting edge; At the oppositeend, it has the usual pin 3, which is threaded to screw to the tool nextabove.

At intervals and alternately extending at right-angles to each other arethe lugs 01'' projections 4, of which there are fourshown in theconstruction illustrated in Figs. 1 and 2. In Fig. 4 there are threelugs or projections 4 two of which extend parallel, and the third oruppermost one at right-angles thereto. g

In Fig, 5, there are two'of these lugs or projections 4- and theseextend at rightangles to each other. This simply illustrates the factthat the number of lugs or projections and their arrangement about thestem or shank may vary according to the requirements.

' In this manner I have provided a bit which stirs and agitates the mud,andwhich is centered, so to speak. in the hole formed.

Other changesmight bemade in the form and arrangement described withoutdepart' ure from the'invention.

I claim: I

1. A cable tool drill bit having a cutting end, a shank integral withsaid cutting end and extending upwardly therefrom, a pair oflugsextending laterally in opposite direc- .tions from said shank andintegral therewith, and asecond pair of integral lugs extendinglaterally in opposite directions from said shank and in a difierenthorizontal plane from the first pair and extending at an angle to saidfirst pair of lugs for holding the shank in spaced apart relation fromthe walls of the drilled opening, each pair of said lugs being arrangedin longitudinal alignment with each other, and the length thereof beingsubstantially coextensive with the length ofgthe cutting end.

2. A cable tool drill bit having a cutting end, a shank integral withsaid cutting end and extending upwardly therefrom, and a pluralityofpairs of lugs arranged in different horizontal planes on the shanlgeachpair of said lugs extending at an angleto another pair, each of saidpairs of lugsextendin laterally in'opposlte directions from said shankand integral therewitlnand arbeing substantially coextensive with the,

length of the cutting end.

In testimony whereof I aflix my signature.

j CHARLES A.

